Uplink synchronization processing method, user equipment, and base station

ABSTRACT

An uplink synchronization processing method, a User Equipment (UE), and a base station are provided. The method includes: receiving a component carrier (CC) uplink synchronization indication message sent by a base station, where the uplink synchronization indication message carries identification information of one or multiple newly configured CCs; sending synchronization signaling to the base station when knowing that the uplink synchronization needs to be executed on all or a part of the one or multiple newly configured CCs corresponding to the identification information; and receiving a time advanced (TA) adjusting message that is sent by the base station according to the synchronization signaling, and applying a TA value carried in the TA adjusting message to the CC on which the uplink synchronization needs to be executed.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No.13/421,665, filed on Mar. 15, 2012, which is a continuation ofInternational Application No. PCT/CN2009/073943, filed on Sep. 15, 2009.The afore-mentioned patent applications are hereby incorporated byreference in their entireties.

TECHNICAL FIELD

The present invention relates to the field of communications, and inparticular, to an uplink synchronization processing method, a UserEquipment (UE), and a base station.

BACKGROUND

A long term evolved-advanced (Long Term Evolved-Advanced, LTE-A) systemneeds to support bandwidth being wider than that of an LTE system, sothat multiple carriers may be aggregated. Carrier aggregation means thatmultiple component carriers (Component Carriers, CCs) are converged to acarrier with bandwidth being wider than that of the LTE system, tosupport a high-speed data rate.

In the prior art, when a user equipment (User Equipment, UE) usesmultiple CCs, under certain scenes, a time advanced (TimeAdvanced, TAvalue) of each CC is different. For example, when a base stationconfigures different CCs on different repeaters (Repeaters), or the CCsof different frequencies pass through different scattering paths, TAvalues of the different CCs are different. Further, for example, whenthe UE communicates with two non-collaborated access points by using twodifferent CCs, the TA values of the two CCs are different.

Therefore, when the TA values of the multiple CCs used by the UE aredifferent, if the base station needs to configure a new CC for the UE,or one of multiple CCs currently used by the UE needs to be replaced bynewly configured CCs, how the UE can achieve uplink synchronization withthe newly configured CCs becomes an urgent problem to be solved.

SUMMARY

Embodiments of the present invention provide an uplink synchronizationprocessing method, a UE, and a base station, to solve a problem how theUE can achieve uplink synchronization with newly configured CCs.

In order to achieve the objective, an embodiment of the presentinvention provides an uplink synchronization processing method, whichincludes:

receiving an uplink synchronization indication message sent by a basestation, where the uplink synchronization indication message carriesidentification information of one or multiple newly configured CCs;

sending synchronization signaling to the base station when knowing thatthe uplink synchronization needs to be executed on all or a part of theone or multiple newly configured CCs corresponding to the identificationinformation; and

receiving a TA adjusting message that is sent by the base stationaccording to the synchronization signaling, and applying a TA valuecarried in the TA adjusting message to the CC on which the uplinksynchronization needs to be executed.

An embodiment of the present invention provides an uplinksynchronization processing method, which includes:

sending an uplink synchronization indication message to a UE, where theuplink synchronization indication message carries identificationinformation of one or multiple newly configured CCs;

receiving synchronization signaling sent by the UE; and

sending a TA adjusting message to the UE according to thesynchronization signaling, to instruct the UE to apply a TA valuecarried in the TA adjusting message to the CC on which the uplinksynchronization needs to be executed.

Correspondingly, an embodiment of the present invention provides a UE,which includes:

a first receiving module, configured to receive an uplinksynchronization indication message sent by a base station, where theuplink synchronization indication message carries identificationinformation of one or multiple newly configured CCs;

a first sending module, configured to send synchronization signaling tothe base station when knowing that the uplink synchronization needs tobe executed on all or a part of the one or multiple newly configured CCscorresponding to the identification information; and

a first processing module, configured to apply a TA value carried in aTA adjusting message to the CC on which the uplink synchronization needsto be executed, after the first receiving module receives the TAadjusting message that is sent by the base station according to thesynchronization signaling.

An embodiment of the present invention provides a base station, whichincludes:

a second sending module, configured to send an uplink synchronizationindication message to a UE, where the uplink synchronization indicationmessage carries identification information of one or multiple newlyconfigured CCs; and

a second receiving module, configured to receive synchronizationsignaling sent by the UE,

where the second sending module is further configured to send a TAadjusting message to the UE according to the synchronization signaling,to instruct the UE to apply a TA value carried in the TA adjustingmessage to the CC on which the uplink synchronization needs to beexecuted.

In the embodiments of the present invention, when a base station needsto configure a new CC for a UE, or one or multiple CCs currently used bythe UE need to be replaced by newly configured CCs, the UE may achieveuplink synchronization with the newly configured CCs by using theobtained TA value. Further, during the procedure, the UE is triggered toexecute the uplink synchronization only through an uplinksynchronization indication message, to save downlink radio resources,and when the UE needs to execute the uplink synchronization, the UE maysend a dedicated preamble to the base station, to obtain a TA valuerequired to be used on the newly configured CC from the base station,thereby improving an uplink synchronization speed.

An embodiment of the present invention further provides an uplinksynchronization processing method, which includes:

receiving an uplink synchronization indication message sent by a basestation, where the uplink synchronization indication message carriesidentification information of one or multiple newly configured CCs; and

executing uplink synchronization on the one or multiple newly configuredCCs, if knowing, according to the identification information of the CCs,that the one or multiple newly configured CCs and a currently used CC donot belong to the same CC group, where the CC group is formed by the oneor multiple CCs sharing the same TA value.

An embodiment of the present invention further provides an uplinksynchronization processing method, which includes:

sending CC group information to a UE in a broadcasting manner or throughdedicated signaling, where the CC group information is used to instructCCs in the same CC group to share a TA value; and

sending an uplink synchronization indication message to the UE, wherethe uplink synchronization indication message carries identificationinformation of one or multiple newly configured CCs, wherein theidentification information is for the UE performing uplinksynchronization on the one or multiple newly configured CCs if the UEknows the one or multiple newly configured CCs and a currently used CCdo not belong to the same CC group according to the identificationinformation of the one or multiple newly configured CCs.

Accordingly, an embodiment of the present invention provides a UE, whichincludes:

a third receiving module, configured to receive an uplinksynchronization indication message sent by a base station, where theuplink synchronization indication message carries identificationinformation of one or multiple newly configured CCs; and

a third processing module, configured to execute uplink synchronizationon the one or multiple newly configured CCs when knowing, according tothe identification information of the CCs, that the one or multiplenewly configured CCs and a currently used CC do not belong to the sameCC group, where the CC group is formed by one or multiple CCs sharingthe same TA value.

An embodiment of the present invention provides a base station, whichincludes:

a third sending module, configured to send CC group information to a UEin a broadcasting manner or through dedicated signaling, where the CCgroup information is used to instruct CCs in the same CC group to sharea TA value; and

a fourth sending module, configured to send an uplink synchronizationindication message to the UE, where the uplink synchronizationindication message carries identification information of one or multiplenewly configured CCs, wherein the identification information is for theUE performing uplink synchronization on the one or multiple newlyconfigured CCs if the UE knows the one or multiple newly configured CCsand a currently used CC do not belong to the same CC group according tothe identification information of the one or multiple newly configuredCCs.

In the embodiments of the present invention, when a CC group exists, aUE may know, according to CC group information and newly configuredidentification information, whether newly configured CCs belong to acertain CC group. When the newly configured CCs belong to a certain CCgroup, uplink synchronization is realized by directly using a TAcorresponding to the CC group, when the newly configured CCs do notbelong to a certain CC group, an uplink synchronization operation may beinitiated to a base station, to obtain a TA value used on the newlyconfigured CC from the base station. Therefore, when the base stationneeds to configure a new CC for the UE, or one or multiple CCs currentlyused by the UE need to be replaced by newly configured CCs, the UE mayachieve the uplink synchronization with the newly configured CCs.

An embodiment of the present invention further provides an uplinksynchronization processing method, which includes:

obtaining a downlink timing value T1 and an uplink TA TA1, which are ofa currently used CC or CC pair, and a downlink timing value T2 of anewly configured CC or CC pair;

obtaining an uplink TA2 of the newly configured CC through calculationby applying formula (2),TA2=TA1+2×(T2−T1)  (2); and

applying an obtained TA2 to the newly configured CC.

In the embodiment of the present invention, a UE may adjust TA situationof a newly configured CC according to the TA value of an alreadyconfigured CC, no matter whether multiple CCs share the TA, the UE maycalculate an uplink TA of the newly configured CC according to adownlink TA and a uplink TA of the already configured CC and thedownlink TA of the newly configured CC. In this embodiment, when a basestation needs to configure a new CC for the UE, or one or multiple CCscurrently used by the UE need to be replaced by newly configured CCs,the UE may achieve the uplink synchronization with the newly configuredCCs.

BRIEF DESCRIPTION OF THE DRAWINGS

To illustrate the technical solutions according to the embodiments ofthe present invention or in the prior art more clearly, the accompanyingdrawings for describing the embodiments or the prior art are introducedbriefly in the following. Apparently, the accompanying drawings in thefollowing description are only some embodiments of the presentinvention; persons skilled in the art may obtain other drawingsaccording to the accompanying drawings without paying creative efforts.

FIG. 1 is a flow chart of Embodiment 1 of an uplink synchronizationprocessing method according to the present invention;

FIG. 2 is a flow chart of Embodiment 2 of an uplink synchronizationprocessing method according to the present invention;

FIG. 3 is a flow chart of Embodiment 3 of an uplink synchronizationprocessing method according to the present invention;

FIG. 4 is a schematic structural diagram of a TA adjusting command inEmbodiment 3 of the uplink synchronization processing method accordingto the present invention;

FIG. 5 is a flow chart of Embodiment 4 of an uplink synchronizationprocessing method according to the present invention;

FIG. 6 is a flow chart of Embodiment 5 of an uplink synchronizationprocessing method according to the present invention;

FIG. 7 is a flow chart of Embodiment 6 of an uplink synchronizationprocessing method according to the present invention;

FIG. 8 is a flow chart of Embodiment 7 of an uplink synchronizationprocessing method according to the present invention;

FIG. 9 is a flow chart of Embodiment 8 of an uplink synchronizationprocessing method according to the present invention;

FIG. 10 is a flow chart of Embodiment 9 of an uplink synchronizationprocessing method according to the present invention;

FIG. 11 is a flow chart of Embodiment 10 of an uplink synchronizationprocessing method according to the present invention;

FIG. 12 is a schematic structural diagram of Embodiment 1 of a UEaccording to the present invention;

FIG. 13 is a schematic structural diagram of Embodiment 1 of a basestation according to the present invention;

FIG. 14 is a schematic structural diagram of Embodiment 2 of a UEaccording to the present invention; and

FIG. 15 is a schematic structural diagram of Embodiment 2 of a basestation according to the present invention.

DETAILED DESCRIPTION

The technical solution of the present invention will be clearly andfully described below with reference to the accompanying drawings. It isobvious that the embodiments to be described are only a part rather thanall of the embodiments of the present invention. All other embodimentsderived by persons skilled in the art based on the embodiments of thepresent invention without carrying out creative activities should fallwithin the protection scope of the present invention.

FIG. 1 is a flow chart of Embodiment 1 of an uplink synchronizationprocessing method according to the present invention. As shown in FIG.1, the method of this embodiment includes the following steps:

Step 101: Receive an uplink synchronization indication message sent by abase station.

The uplink synchronization indication message carries identificationinformation of one or multiple newly configured CCs.

For example, the uplink synchronization indication message may be a CCreconfiguration message or a Physics Downlink Control Channel (PDCCH)signaling.

The uplink synchronization indication message carries the identificationinformation of the one or multiple newly configured CCs, and theidentification information is used by the base station, for example, aneNodeB, to indicate to the UE which CC(s) is (are) newly configured, orfor an FDD system, when the eNodeB reconfigures CCs in pairs, theidentification information of the CCs may also represent one or multiplepairs of uplink and downlink CCs. The so-called reconfiguration of theCCs in pairs refers to that the eNodeB notifies to configure an uplinkCC and a downlink CC, and the uplink CC and the downlink CC form a CCpair. Under the situation, the identification information of the CCs maybe the identification information of the CC pair. The meaning of theidentification information of the CCs in other embodiments is the sameas the mentioned, so that description is not given in other parts of theembodiments of the present invention.

It should be noted that the CC reconfiguration message may further carrydetailed configuration information of the newly configured CCs.

In this embodiment, the uplink synchronization indication message may besent as an independent radio resource control (Radio Resource Control,RRC) message or a medium access control protocol data unit (MediumAccess Control Protocol Data Unit, MAC PDU), or is sent by being carriedin an RRC connection reconfiguration message.

Step 102: Send synchronization signaling to the base station whenknowing, according to the uplink synchronization indication message,that the uplink synchronization needs to be executed on all or a part ofthe one or multiple newly configured CCs corresponding to theidentification information.

After receiving the uplink synchronization indication message, forexample, the CC reconfiguration message or the PDCCH, the UE may knowthe newly configured CC(s), and also know whether the uplinksynchronization needs to be executed on the all or a part of the one ormultiple newly configured CCs corresponding to the identificationinformation.

The synchronization signaling is a synchronization sequence. Forexample, the synchronization signaling of this embodiment may be adedicated preamble (preamble) or a sounding reference signal (Soundingreference signal, Sounding RS). When the UE needs to execute the uplinksynchronization, the CC reconfiguration message or the PDCCH includes adedicated preamble distributed for the UE, in addition, a manner thatthe dedicated preamble indicates whether the UE needs to execute theuplink synchronization on the one or multiple newly configured CCs maybe:

1. Explicit indication: in the CC reconfiguration message or the PDCCH,dedicated bit indication information indicates whether the UE requiresexecuting the uplink synchronization on all or a part of the one ormultiple CCs; and

2. Implicit indication: if the CC reconfiguration message or the PDCCHincludes distribution information of the dedicated preamble, itrepresents that the UE needs to execute the uplink synchronization onall or a part of the one or multiple CCs, if the CC reconfigurationmessage or the PDCCH does not include the distribution information ofthe dedicated preamble, it represents that the UE may not execute theuplink synchronization; that is, the UE may judge whether the CCreconfiguration message or the PDCCH includes the dedicated preamble, ifthe CC reconfiguration message or the PDCCH includes the dedicatedpreamble, the UE executes the uplink synchronization by using thepreamble.

Therefore, the knowing, according to the uplink synchronizationindication message, that the uplink synchronization needs to be executedon all or a part of the one or multiple newly configured CCscorresponding to the identification information in step 102 may include:

knowing that the uplink synchronization needs to be executed on the allor a part of the one or multiple newly configured CCs corresponding tothe identification information, according to bit indication informationwhich is in the uplink synchronization indication message and is used toindicate whether the uplink synchronization needs to be executed on allor a part of the one or multiple newly configured CCs; or

knowing that the uplink synchronization needs to be executed on all orapart of the one or multiple newly configured CCs corresponding to theidentification information, according to distribution information ofdedicated preamble in the uplink synchronization indication message.

Therefore, when judging, according to the uplink synchronizationindication message, that the uplink synchronization needs to beexecuted, the UE may obtain a corresponding dedicated preamble from theuplink synchronization indication message, and when executing the uplinksynchronization, the UE may send the dedicated preamble to the basestation, to request the base station to indicate, according to thededicated preamble, a TA value that can be used.

Step 103: Receive a TA adjusting message that is sent by the basestation according to the synchronization signaling, and apply a TA valuecarried in the TA adjusting message to the CC on which the uplinksynchronization needs to be executed.

After receiving the dedicated preamble sent by the UE, the base stationsends the TA adjusting message to the UE, where the TA adjusting messagecarries the TA value required to be applied to the newly configured CCon which the uplink synchronization needs to be executed.

During specific implementation, the UE may obtain TA_(new) required tobe used on the CC on which the uplink synchronization needs to beexecuted through calculation by applying formula (1), and apply theTA_(new) to the CC,TA _(new) =TA _(reference)+(TA−M)×Ts  (1)

where TA_(reference) represents a TA value on a currently used CC, areference value sent by the base station in the uplink synchronizationindication message, or the TA value on the CC when an RRC connection isestablished at the first time, or a TA value on an anchor CC; M is apreset empirical value; T_(s)=1/(15000×2048).

Till now, the UE may use the TA_(new) on the CC on which the uplinksynchronization needs to be executed, so that when the base stationneeds to configure a new CC for the UE, or one or multiple CCs currentlyused by the UE need to be replaced by newly configured CCs, the UE mayachieve the uplink synchronization with the newly configured CCs byusing the TA_(new). Further, during the procedure, the UE is triggeredto execute the uplink synchronization only through the uplinksynchronization indication message, to save downlink radio resources,and when the UE needs to execute the uplink synchronization, the UE maysend the synchronization signaling, for example, the dedicated preamble,to the base station, to obtain a TA value required to be used on thenewly configured CC from the base station, thereby improving an uplinksynchronization speed.

In another embodiment of the uplink synchronization processing methodaccording to the present invention, when it is known, according to theuplink synchronization indication message, that the uplinksynchronization does not need to be executed on all or a part of the oneor multiple newly configured CCs corresponding to the identificationinformation, the indicated TA value in the uplink synchronizationindication message is applied to the newly configured CC on which theuplink synchronization does not need to be executed; or when it is knownthat the uplink synchronization does not need to be executed on all or apart of the one or multiple newly configured CCs corresponding to theidentification information according to the uplink synchronizationindication message, a unique TA value on the currently used CC isapplied to all or a part of CCs on which the uplink synchronization doesnot need to be executed on the one or multiple newly configured CCs.

The knowing, according to the uplink synchronization indication message,that the uplink synchronization does not need to be executed on the allor a part of the one or multiple newly configured CCs corresponding tothe identification information, may include:

when a TA value of one newly configured CC is the same as a TA value ofany CC in the currently used one or multiple CCs, the indicated TA valueincludes: the TA value that is on the one newly configured CC andrequires adjustment, or identification information of the currently usedCC, the identification information of the CC represents that the TAvalue required to be used on the newly configured CC is the same as theTA value on the CC corresponding to the identification information ofthe CC;

when the TA values of the multiple newly configured CCs are the same asthe TA value of the currently used CC, the indicated TA value includes:the TA values respectively corresponding to the multiple newlyconfigured CCs, indices of the TA values respectively corresponding tothe multiple newly configured CCs, or a index of the currently used CC,and the TA value required to be used by the newly configured CC is thesame as the TA value on the CC corresponding to the index of the CC.

Specifically, if the UE does not need to execute the uplinksynchronization, the base station may indicate to the UE the TA valuesthat can be used, and a specific manner may be:

when the UE is currently only configured to use one CC or TA values ofthe multiple currently used CCs are the same, the base station indicatesto the UE whether the currently used TA value may be used;

alternatively, when the UE is currently only configured to use multipleCCs, and the UE is using multiple different TA values, the base stationindicates to the UE the TA values that should be used on the newlyconfigured CCs. Under the situation, the base station may directlynotify the UE of the TA values required to be used by the UE, and mayalso number the TA values currently used by the UE, and notify the UE ofthe indices of the TA values required to be used on the newly configuredCCs, or may notify the UE of the index of a certain currently used CC,and the UE receives index information of the CC, which represents thatthe newly configured CC may use the TA value of the CC corresponding tothe index.

Further, in another situation, when it is known, according to the uplinksynchronization indication message, that the uplink synchronization doesnot need to executed on all or a part of the one or multiple newlyconfigured CCs corresponding to the identification information, theunique TA value on the currently used CC is applied to the CC on whichthe uplink synchronization does not need to be executed on the one ormultiple newly configured CCs. Specifically, the UE and the base stationmay know in advance that the TA values of the CCs currently used by theUE are the same, that is, all the CCs use the unique TA value, and here,the base station does not need to exclusively indicate the TA value tothe UE. When the UE knows, after receiving the uplink synchronizationindication message, that the uplink synchronization does not need to beexecuted on all or a part of the one or multiple newly configured CCscorresponding to the identification information, the UE may directlyapply the unique TA value of the currently used CC to the newlyconfigured CC on which the uplink synchronization does not need to beexecuted.

Therefore, when the UE knows, according to the received uplinksynchronization indication message, that the uplink synchronization doesnot need to be executed on the all or a part of the one or multiplenewly configured CCs corresponding to the identification information,the UE may directly apply the indicated TA value in the uplinksynchronization indication message to a CC that is in the newlyconfigured CCs and on which the uplink synchronization does not need tobe executed, or directly apply the unique TA value of the currently usedCC to the newly configured CC on which the uplink synchronization doesnot need to be executed, so that when the UE does not need to executethe uplink synchronization, the UE may achieve the uplinksynchronization with the newly configured CCs.

FIG. 2 is a flow chart of Embodiment 2 of an uplink synchronizationprocessing method according to the present invention. As shown in FIG.2, the method of this embodiment may include the following steps:

Step 201: Send an uplink synchronization indication message to a UE.

The uplink synchronization indication message carries identificationinformation of one or multiple newly configured CCs.

For example, the uplink synchronization indication message may be a CCreconfiguration message or a PDCCH signaling.

The uplink synchronization indication message may be sent as an RRCmessage or an MAC PDU, or is sent by being carried in an RRC connectionreconfiguration message.

Specifically, when the UE needs to execute uplink synchronization, theuplink synchronization indication message may include a dedicatedpreamble or a Sounding RS where the dedicated preamble or the SoundingRS is distributed for the UE, and a manner that the dedicated preambleor the Sounding RS indicates whether the UE needs to execute the uplinksynchronization on the one or multiple newly configured CCs may be theexplicit indication or the implicit indication, which is not describedhere again.

Therefore, the sending the uplink synchronization indication message tothe UE in step 201 may include: sending an extended TA value adjustingcommand to the UE; correspondingly, the method further includes: sendingthe CC reconfiguration message to the UE, so that the UE obtainsconfiguration information of the CC corresponding to the identificationinformation according to the CC reconfiguration message; or

may include: sending the CC reconfiguration message to the UE, where theCC reconfiguration message includes a TA value of the UE, which is onthe one newly configured CC and requires adjustment, or the CCreconfiguration message includes one or multiple TA values of the UE,which is on the multiple newly configured CCs and requires adjustment,and identification information of the CC corresponding to each TA value.

Step 202: Receive synchronization signaling sent by the UE, after the UEknows, according to the uplink synchronization indication message, thatthe uplink synchronization needs to be executed on all or a part of theone or multiple newly configured CCs corresponding to the identificationinformation.

When the UE judges, according to the uplink synchronization indicationmessage, that the uplink synchronization needs to be executed, the UEmay obtain the corresponding dedicated preamble or the Sounding RS fromthe uplink synchronization indication message. When executing the uplinksynchronization, the UE may send the dedicated preamble or the SoundingRS to the base station, and the base station may indicate, according tothe dedicated preamble or the Sounding RS, to the UE the TA values thatcan be used.

The base station may newly configure a CC for the UE according to abandwidth demand, or may also newly configure multiple CCs or multipleCC groups (an uplink CC and a downlink CC may be called a CC group) forthe UE. For the situation of newly configuring multiple CCs or multipleCC groups, the base station may only distribute a dedicated preamble forthe UE, that is, the dedicated preamble is shared by multiple CCs; ofcourse, multiple preambles may also be distributed to the UE. Therefore,the receiving the dedicated preamble sent by the UE in step 202 mayinclude: receiving a dedicated preamble sent by the UE, where thededicated preamble is sent on all or a part of CCs on which the uplinksynchronization needs to be executed on the multiple newly configuredCCs; or receiving multiple dedicated preambles sent by the UE, where themultiple dedicated preambles are sent on all or a part of CCs on whichthe uplink synchronization needs to be executed on the multiple newlyconfigured CCs

Step 203: Send a TA adjusting message to the UE according to thesynchronization signaling, so that the UE applies a TA value carried inthe TA adjusting message to the CC on which the uplink synchronizationneeds to be executed.

For example, the synchronization signaling is the dedicated preamble,and after receiving the dedicated preamble sent by the UE, the basestation may send the TA adjusting message to the UE, where the TAadjusting message may carry the TA value required to be applied to thenewly configured CCs on which the uplink synchronization needs to beexecuted.

The sending the TA adjusting message to the UE may include: sending theextended TA value adjusting command to the UE, where the extended TAvalue adjusting command includes the TA value of the UE, which is on theone newly configured CC and requires adjustment, or the extended TAvalue adjusting command includes one or multiple TA values of the UE,which are on the multiple newly configured CCs and require adjustment,and identification information of the CC corresponding to each TA value.

During specific implementation, the UE may obtain TA_(new) required tobe used on the CC on which the uplink synchronization needs to beexecuted through calculation by applying formula (1), and apply theTA_(new) to the CC that needs to execute the uplink synchronization.

Till now, the UE may use the TA_(new) on the CC on which the uplinksynchronization needed to be executed, so that when the base stationneeds to configure a new CC for the UE, or one or multiple CCs currentlyused by the UE needs to be replaced by newly configured CCs, the UE mayachieve the uplink synchronization with the newly configured CCs byusing the TA_(new). Further, during the procedure, the UE is triggeredto execute the uplink synchronization only through an uplinksynchronization indication message, to save downlink radio resources,and when the UE needs to execute the uplink synchronization, the UE maysend the synchronization signaling, for example, the dedicated preambleto the base station, to obtain the TA values required to be used on thenewly configured CCs from the base station, thereby improving an uplinksynchronization speed.

In another embodiment of the uplink synchronization processing methodaccording to the present invention, when the base station does not needthe UE to execute the uplink synchronization, a manner in the followingmay be adopted.

The uplink synchronization indication message carrying the indicated TAvalue is sent to the UE, when a TA value of one newly configured CC isthe same as a TA value of any CC in the currently used one or multipleCCs, the indicated TA value may include: the TA value that is on the onenewly configured CC and require adjustment, or identificationinformation of the currently used CC, the identification information ofthe CC represents that the TA value required to be used on the newlyconfigured CC is the same as the TA value on the CC corresponding to theidentification information of the CC;

when the TA values of the multiple newly configured CCs are the same asthe TA value of the currently used CC, the indicated TA value mayinclude: the TA values respectively corresponding to the multiple newlyconfigured CCs, indices of the TA values respectively corresponding tothe multiple newly configured CCs, or a index of the currently used CC,and the TA value required to be used by the newly configured CC is thesame as the TA value of the CC corresponding to the index of the CC.

Specifically, if the UE does not need to execute the uplinksynchronization, the base station indicates to the UE the TA values thatcan be used, and a specific manner may be:

when the UE is currently only configured to use one CC or TA values ofthe multiple currently used CCs are the same, the base station indicatesto the UE whether the currently used TA value may be used;

alternatively, when the UE is currently only configured to use multipleCCs, and the UE is using multiple different TA values, the base stationindicates to the UE the TA values used on the newly configured CCs.Under the situation, the base station may directly notify the UE of theTA values required to be used by the UE, and may also number the TAvalues currently used by the UE, and notify the UE of the indices of theTA values required to be used on the newly configured CCs, or may notifythe UE of the index of a certain currently used CC, and the UE receivesindex information of the CC, which represents that the newly configuredCC may use the TA value on the CC corresponding to the index.

Further, in another situation, when it is known, according to the uplinksynchronization indication message, that the uplink synchronization doesnot need to be executed on all or a part of the one or multiple newlyconfigured CCs corresponding to the identification information, theunique TA value on the currently used CC is applied to all or a part ofthe CCs on which the uplink synchronization does not need to be executedin the one or multiple newly configured CCs. Specifically, the UE andthe base station may know in advance that the TA values of the CCscurrently used by the UE are the same, that is, all the CCs use theunique TA value, and here, the base station does not need to exclusivelyindicate the TA value to the UE. When the UE knows, after receiving theuplink synchronization indication message, that the uplinksynchronization does not need to be executed on all or a part of the oneor multiple newly configured CCs corresponding to the identificationinformation, the UE may directly apply the unique TA value of thecurrently used CC to the newly configured CC on which the uplinksynchronization does not need to be executed.

Therefore, when the UE knows, according to the received uplinksynchronization indication message, that the uplink synchronization doesnot need to be executed on all or a part of the one or multiple newlyconfigured CCs corresponding to the identification information, the UEmay directly apply the indicated TA value in the uplink synchronizationindication message to a CC that is in the newly configured CCs and onwhich the uplink synchronization does not need to be executed, ordirectly apply the unique TA value of the currently used CC to the newlyconfigured CC on which the uplink synchronization does not need to beexecuted, so that when the UE does not need to execute the uplinksynchronization, the UE may achieve the uplink synchronization with thenewly configured CCs.

In the following, the above mentioned embodiment is described in detailby adopting several detailed embodiments, and the following embodimentsmake descriptions by taking an example that the synchronizationsignaling is the dedicated preamble.

FIG. 3 is a flow chart of Embodiment 3 of an uplink synchronizationprocessing method according to the present invention. As shown in FIG.3, the method of this embodiment may include the following steps:

Step 301 a: A base station sends a CC reconfiguration message to a UE.

The CC reconfiguration message carries identification information of oneor multiple newly configured CCs, where the identification informationis used by the base station to indicate newly configured CC(s) to theUE. The CC reconfiguration message may carry detailed configurationinformation of the newly configured CCs.

After receiving the CC reconfiguration message, the UE may know thenewly configured CC(s), and may also know whether the uplinksynchronization needs to be executed on the all or a part of the one ormultiple newly configured CCs corresponding to the identificationinformation.

Step 302 a: The UE judges, according to the CC reconfiguration message,whether the uplink synchronization needs to be executed, and if the UEjudges that the uplink synchronization needs to be executed, step 303 ais executed, and if the UE judges that the uplink synchronization doesnot need to be executed, step 304 a is executed.

Specifically, when the UE needs to execute the uplink synchronization,the CC reconfiguration message includes a dedicated preamble distributedfor the UE.

When the UE does not need to execute the uplink synchronization, TAvalues that can be used are indicated to the UE, and a specific manneris described in the above mentioned embodiment, and is not describedhere again.

After the UE receives the CC reconfiguration message, if the CCreconfiguration message indicates the dedicated preamble, it representsthat the UE needs to execute the uplink synchronization on all or a partof the one or multiple CCs, and if the CC reconfiguration messageindicates relevant information of the TA, the UE does not need toexecute the uplink synchronization, and the UE may directly realize theuplink synchronization with the newly configured CCs according to therelevant information of the TA.

Step 303 a: The UE sends the dedicated preamble to the base station, andstep 305 a is executed.

In this embodiment, the base station may newly configure a CC for the UEaccording to a bandwidth demand, or may also newly configure multipleCCs or multiple CC groups (an uplink CC and a downlink CC may be calleda CC group) for the UE. For the situation of newly configuring multipleCCs or multiple CC groups, the base station may only distribute adedicated preamble for the UE, that is, the dedicated preamble is sharedby multiple CCs; of course, multiple preambles may be distributed to theUE.

When knowing, after receiving the CC reconfiguration message sent by thebase station, that it is required to execute the uplink synchronization,the UE sends the indicated dedicated preamble in the CC reconfigurationmessage to the base station, so that the base station may feedback theTA values to the UE according to the dedicated preamble.

Step 304 a: The UE applies the indicated TA values in the CCreconfiguration message to the newly configured CC on which the uplinksynchronization does not need to be executed.

Step 305 a: The base station sends an extended TA adjusting command tothe UE.

The extended TA adjusting command may include identification informationof the CC corresponding to the TA value. When only one or a pair ofnewly configured CCs exist, or when only one or a pair of CCs in themultiple newly configured CCs on which the uplink synchronization needsto be executed, the extended TA adjusting command may not include theidentification information of the CC, and the TA adjusting command is TAadjustment corresponding to the newly configured CCs by default. Then,the UE applies the TA value to the CC that is in the newly configuredCCs and on which the uplink synchronization needs to be executed.

For example, the extended TA adjusting command may be an MAC-PDU. FIG. 4is a schematic structural diagram of a TA adjusting command inEmbodiment 3 of the uplink synchronization processing method accordingto the present invention. As shown in FIG. 4, the identificationinformation of the CC, that is, a bit index of a CC index is 2-3 bits,and a index of the bit occupied by the extended TA adjusting commandextended TA command may be 5-6 bits, or more bits. In order todifferentiate the MAC PDU in this embodiment from other MAC PDUsreceived by the UE, the MAC PDU of the extended TA adjusting command ofthis embodiment may be sent by using a reserved logic channel in acurrent LTE system, for example, a logic channel with an index numberbeing 11011, and of course, reserved logic channels in other LTE systemsmay also be used.

Step 306 a: The UE applies the TA value carried in the extended TAadjusting command to the CC on which the uplink synchronization needs tobe executed.

For example, the UE may calculate the TA value by adopting formula (1),or a manner for calculating the TA may also be:TA _(new) =TA×Ts.

In addition, in the embodiment, when the base station newly configures,for the UE, multiple CCs on which the uplink synchronization needs to beexecuted in the CC reconfiguration message, the base station mayexplicitly notify the UE of the CC on which the TA adjusting command isreceived in the CC reconfiguration message. That is, when the basestation sends the CC reconfiguration message to the UE, the base stationindicates to the UE the identification information of the CC used toreceive the TA adjusting command. Alternatively, the base station maynotify the UE of the identification information of the CC used toreceive the TA adjusting command by using dedicated RRC signaling or MACPDU, or physical layer signaling. In other embodiments of the presentinvention, the method for receiving the TA adjusting command may use theabove method. Therefore, in other parts of the present invention, thedescription is not repeated.

Till now, the UE may use the TA_(new) on the CC on which the uplinksynchronization needs to be executed, so that when the base stationneeds to configure a new CC for the UE, or one or multiple CCs currentlyused by the UE need to be replaced by newly configured CCs, the UE mayachieve the uplink synchronization with the newly configured CCs byusing the TA_(new). Further, during the procedure, the UE is triggeredto execute the uplink synchronization only through the uplinksynchronization indication message, to save downlink radio resources,and when the UE needs to execute the uplink synchronization, the UE maysend the dedicated preamble to the base station, to obtain TA valuesrequired to be used on the newly configured CCs from the base station,thereby improving an uplink synchronization speed.

In addition, in the embodiment, when the UE performs communication byusing multiple CCs, when the base station needs the UE to accuratelyadjust a current TA value on the multiple currently used CCs, the basestation may use the extended TA adjusting command MAC PDU as shown inFIG. 4 and described in step 305 a. That is, when the base station needsto accurately adjust the TA values of the multiple CCs currently used bythe UE, the base station may send the extended TA adjusting command MACPDU to the UE, where the TA adjusting command MAC PDU includes theidentification information of the CC that requires adjustment of the UE,and the corresponding TA value that requires adjustment. Under thesituation, the TA value that requires adjustment is different from theTA value that requires adjustment in step 305 that adjustmentgranularity of the TA value under the situation is more accurate. Afterreceiving the TA adjusting command MAC PDU, correspondingly the UEadjusts the TA values that are on each CC indicated in the command andrequire adjustment. In other embodiments of the present invention, theabove accurate adjustment procedure may exist, so description is notrepeated in other embodiments.

Further, the CC reconfiguration message of this embodiment may includeinformation of a physics uplink shared channel (Physics Uplink SharedChannel, PUSCH) resource used to send the dedicated preamble to the basestation, and the information of the frame starting from which the PUSCHresource is used. Specifically, when distributing the dedicated preamblefor the UE of the CCs to be reconfigured, the base station dispatches,on the PUSCH channel of the CCs to be configured, dedicated resource ofsending the dedicated preamble, and in the embodiment, the dedicatedPUSCH resource may be distributed for the UE in the CC reconfigurationmessage of triggering the UE to execute the uplink synchronization, sothat the UE dispatches, on the newly configured CCs, the PUSCH resourceto send the dedicated preamble. Here, the CC reconfiguration messageneeds to explicitly notify the UE of a index of the frame used to sendthe dedicated PUSH resource of the dedicated Preamble. When sending theCC reconfiguration message to the UE, the base station dispatches the UEto send the dedicated PUSCH resource of the dedicated Preamble, so thatnegative effects caused by the CC reconfiguration process on a normalrandom access procedure are effectively reduced.

FIG. 5 is a flow chart of Embodiment 4 of an uplink synchronizationprocessing method according to the present invention. As shown in FIG.5, the method of this embodiment may include the following steps:

Step 301 b: A base station sends a PDCCH signaling to a UE.

The PDCCH may carry identification information of one or multiple newlyconfigured CCs, where the identification information is used by the basestation to indicate newly configured CC(s) to the UE.

Step 302 b: The UE judges, according to the PDCCH, whether uplinksynchronization needs to be executed, and if the UE judges that theuplink synchronization needs to be executed, step 303 b is executed, andif the UE judges that the uplink synchronization does not need to beexecuted, step 304 b is executed.

Specifically, when the UE needs to execute the uplink synchronization,the PDCCH includes a dedicated preamble distributed for the UE.

When the UE does not need to execute the uplink synchronization, TAvalues that can be used are indicated for the UE, and a specific manneris not described here again.

After the UE receives the PDCCH, if the PDCCH indicates the dedicatedpreamble, it represents that the UE needs to execute the uplinksynchronization on all or a part of the one or multiple CCs, and if thePDCCH indicates relevant information of the TA, the UE does not need toexecute the uplink synchronization, and the UE may directly realize theuplink synchronization with the newly configured CCs according to therelevant information of the TA.

Step 303 b: The UE sends the dedicated preamble to the base station, andstep 305 b is executed.

The base station may newly configure a CC for the UE according to abandwidth demand, or may also newly configure multiple CCs or multipleCC pairs for the UE. For the situation of newly configuring multiple CCsor multiple CC pairs, the base station may only distribute a dedicatedpreamble for the UE, that is, the dedicated preamble is shared bymultiple CCs; of course, multiple preambles may be distributed to theUE.

When knowing, after receiving the PDCCH sent by the base station, thatit is required to execute the uplink synchronization, the UE sends theindicated dedicated preamble in the PDCCH to the base station, so thatthe base station may feed back the TA values to the UE according to thededicated preamble.

Step 304 b: The UE applies the indicated TA values in the PDCCH to thenewly configured CC on which the uplink synchronization does not need tobe executed.

Step 305 b: The base station sends an extended TA adjusting command tothe UE.

The extended TA adjusting command may include identification informationof the CC corresponding to the TA value. When only one or a pair ofnewly configured CCs exist, or when only one or a pair of CCs in themultiple newly configured CCs on which the uplink synchronization needsto be executed, the extended TA adjusting command may also not includethe identification information of the CC, and the TA adjusting commandis TA adjustment corresponding to the newly configured CCs by default.Then, the UE applies the TA value to the CC that is in the newlyconfigured CCs and on which the uplink synchronization needs to beexecuted.

For example, the extended TA adjusting command may be an MAC PDU, and astructure may be the structure as shown in FIG. 4 and is not describedagain.

Step 306 b: The UE applies the TA value carried in the extended TAadjusting command to the CC on which the uplink synchronization needs tobe executed.

A method for calculating the TA value by the UE is not described again.

Till now, the UE may use the TA_(new) on the CC on which the uplinksynchronization needs to be executed, so that when the base stationneeds to configure a new CC for the UE, or one or multiple CCs currentlyused by the UE need to be replaced by newly configured CCs, the UE mayachieve the uplink synchronization with the newly configured CCs byusing the TA_(new). Further, during the procedure, the UE is triggeredto execute the uplink synchronization only through the uplinksynchronization indication message, to save downlink radio resources,and when the UE needs to execute the uplink synchronization, the UE maysend the dedicated preamble to the base station, to obtain TA valuesrequired to be used on the newly configured CCs from the base station,thereby improving an uplink synchronization speed.

Step 307 b: The UE receives a CC reconfiguration message sent by thebase station.

In this embodiment, the PDCCH triggers the UE to perform the uplinksynchronization and does not include detailed configuration informationof the newly configured CCs, so that in this embodiment, the basestation may send the CC reconfiguration message to the UE, so that theUE obtains the configuration information of the CC corresponding to theidentification information according to the CC reconfiguration message.

Further, in this embodiment, the dedicated PUSCH resource may bedistributed to the UE, so that the UE may dispatch, on the newlydistributed CC, the PUSCH resource to send the dedicated preamble, sothat negative effects caused by the CC reconfiguration process on anormal random access procedure are effectively reduced.

FIG. 6 is a flow chart of Embodiment 5 of an uplink synchronizationprocessing method according to the present invention. As shown in FIG.6, the method of this embodiment may include the following steps:

Step 301 c: A base station sends a PDCCH signaling to a UE.

The PDCCH may carry identification information of one or multiple newlyconfigured CCs, where the identification information is used by the basestation to indicate newly configured CC (s) to the UE.

Step 302 c: The UE judges, according to the PDCCH, whether uplinksynchronization needs to be executed, and if the UE judges that theuplink synchronization needs to be executed, step 303 c is executed, andif the UE judges that the uplink synchronization does not to need to beexecuted, step 304 c is executed.

Specifically, when the UE needs to execute the uplink synchronization,the PDCCH includes a dedicated preamble distributed for the UE, and thededicated preamble may adopt the implicit indication or the explicitindication.

When the UE does not need to execute the uplink synchronization, TAvalues that can be used are indicated to the UE, and a specific manneris not described here again.

After the UE receives the PDCCH, if the PDCCH indicates the dedicatedpreamble, it represents that the UE needs to execute the uplinksynchronization on all or a part of the one or multiple newly configuredCCs, and if the PDCCH indicates relevant information of the TA, the UEdoes not need to execute the uplink synchronization, and the UE maydirectly realize the uplink synchronization with the newly configuredCCs according to the relevant information of the TA.

Step 303 c: The UE sends the dedicated preamble to the base station, andstep 305 c is executed.

The base station may newly configure a CC for the UE according to abandwidth demand, or may also newly configure multiple CCs or multipleCC pairs for the UE. For the situation of newly configuring multiple CCsor multiple CC pairs, the base station may only distribute a dedicatedpreamble to the UE, that is, the dedicated preamble is shared bymultiple CCs; of course, multiple preambles may be distributed to theUE.

Step 304 c: The UE applies the indicated TA values in the PDCCH to thenewly configured CC on which the uplink synchronization does not need tobe executed.

Step 305 c: The base station sends a CC reconfiguration message to theUE.

The CC reconfiguration message includes a TA value of the UE, which ison the one newly configured CC and requires adjustment, or the CCreconfiguration message includes one or multiple TA values of the UE,which are on the multiple newly configured CCs and require adjustment,and identification information of the CC corresponding to each TA value.

When the base station newly configures a CC for the UE, the UE mayobtain a TA value through the CC reconfiguration message; when the basestation newly configures multiple CCs for the UE, the CC reconfigurationmessage may indicate a TA value for the multiple newly configured CCs,and may also indicate the TA values respectively for the multiple CCs,where when the TA values are respectively indicated, it is alsonecessary to enable the respectively indicated TA values to correspondto the identification information of the corresponding CC.

Step 306 c: The UE applies the TA value carried in the CCreconfiguration message to the CC on which the uplink synchronizationneeds to be executed.

A method for calculating the TA value by the UE is not described again.

Till now, the UE may use the TA_(new) on the CC on which the uplinksynchronization needs to be executed, so that when the base stationneeds to configure a new CC for the UE, or one or multiple CCs currentlyused by the UE need to be replaced by newly configured CCs, the UE mayachieve the uplink synchronization with the newly configured CCs byusing the TA_(new). Further, during the procedure, the UE is triggeredto execute the uplink synchronization only through the uplinksynchronization indication message, to save downlink radio resources,and when the UE needs to execute the uplink synchronization, the UE maysend the dedicated preamble to the base station, to obtain TA valuesrequired to be used on the newly configured CCs from the base station,thereby improving an uplink synchronization speed.

Further, in this embodiment, the dedicated PUSCH resource may bedistributed for the UE, so that the UE may dispatch, on the newlydistributed CC, the PUSCH resource to send the dedicated preamble, sothat negative effects caused by the CC reconfiguration process on anormal random access procedure are effectively reduced.

FIG. 7 is a flow chart of Embodiment 6 of an uplink synchronizationprocessing method according to the present invention. As shown in FIG.7, the method of this embodiment may include the following steps:

Step 401: Receive an uplink synchronization indication message sent by abase station.

The uplink synchronization indication message may be a CCreconfiguration message or a PDCCH signaling.

The uplink synchronization indication message carries identificationinformation of one or multiple newly configured CCs, and theidentification information is used by the base station, for example, aneNodeB, to indicate to the UE which CC(s) is (are) newly configured. TheCC reconfiguration message may further carry detailed configurationinformation of the newly configured CCs. In this embodiment, the uplinksynchronization indication message may be sent as an independent RRCmessage or an MAC PDU, or is sent by being carried in an RRC connectionreconfiguration message.

Step 402: Execute uplink synchronization on the one or multiple newlyconfigured CCs, if knowing, according to the identification informationof the CCs, that the one or multiple newly configured CCs and acurrently used CC do not belong to the same CC group.

The CC group is formed by one or multiple CCs sharing the same TA value.

Given a situation that in the multiple CCs, several CCs may share a TA,and the other CCs may share another TA, the CCs may be grouped accordingto whether the CCs may share the same TA. In order to enable the UE toobtain CC group information in advance, to know, according to the groupinformation, whether the newly configured CCs belong to a certain CCgroup, and in this embodiment, before step 701, the method may furtherinclude: receiving the CC group information sent by the base station ina broadcasting manner or through dedicated signaling, where the CCs inthe same CC group share a TA value.

When knowing, according to the identification information of the newlyconfigured CCs, that the one or multiple newly configured CCs and thecurrently used CC do not belong to the same CC group, the UE executesthe uplink synchronization on the one or multiple newly configured CCs.The specific procedure of executing the uplink synchronization may adopta random access process based on competition. The random access processbased on competition may be that: the UE sends a random access Preamblemessage “Random Access Preamble” to the base station, and selectedPreambles (a total index of 64) implicit a size of a firstly dispatcheduplink message required to be sent by the UE subsequently; then, thebase station delivers a random access response message “Random AccessResponse” on a downlink synchronization channel, where the message isgenerated by a physical layer. A Timing Advance Command field in themessage includes the TA value of the UE, which requires adjustmentduring uplink sending, and a UL Grant field represents information of abandwidth resource distributed to the firstly dispatches uplink messagesent by the UE. A Temporary C-RNTI field represents temporaryidentification information distributed for the UE. RAPID in an MACHeader represents identification information of the preamble sent by theUE, that is, Random Access Preamble ID; in addition, multiple CCs in theCCs newly configured by the base station for the UE need the UE toexecute the uplink synchronization, it is necessary to modify anexisting random access response message.

When a preamble randomly selected by the UE needs to be sent on themultiple CCs on which the uplink synchronization needs to be executed,in addition to the information required to be carried, the random accessresponse message sent by the base station to the UE further needs tocarry the identification information of the CC respectivelycorresponding to the multiple TA values, so that after receiving therandom access response message, the UE may explicitly know acorresponding relationship between the TA value requiring adjustment andthe CC.

When the UE randomly selects multiple preambles and sends differentpreambles on the multiple CCs on which the uplink synchronization needsto be executed, the existing random access response message does notneed to be modified.

In addition, after the UE randomly selects the preamble, in order toenable the base station to explicitly know the preamble selected by theUE, the UE sends, on the currently used CC, the identificationinformation of the selected preamble to the base station. When the basestation detects, on the CC on which the uplink synchronization needs tobe executed, the preamble reported by the UE, the base station may sendthe TA value to the UE by using the random access response message orthe extended. TA command message, according to the TA value obtainedthrough the detection of the preamble. Under the situation, the basestation identifies the UE based on the preamble, so that the basestation may not distribute, in the random access response message, thebandwidth resource used to send the uplink message for the UE, and mayomit to send a competition solving message to the UE.

According to indication of the random access response message “RandomAccess Response”, the UE sends the firstly dispatches uplink message onthe uplink synchronization channel; and finally, in order to solve aconflict problem caused when the multiple UEs use the same preamble, thebase station sends a conflict solving message to the UE.

Preferably, the procedure of executing the uplink synchronization on theone or multiple newly configured CCs of this embodiment may adopt theuplink synchronization method described in any one of Embodiment 1 toEmbodiment 5, and is not described again.

In another embodiment of the uplink synchronization processing methodaccording to the present invention, if the one or multiple newlyconfigured CCs and the currently used CC belong to the same CC group,the TA value of the currently used CC is used on the one or multipleCCs.

In this embodiment, when a CC group exists, the UE may know, accordingto the CC group information and the newly configured identificationinformation, whether the newly configured CCs belong to the certain CCgroup, and when the newly configured CCs belong to the certain CC group,the UE realizes the uplink synchronization by directly using the TAcorresponding to the CC group, and when the newly configured CCs do notbelong to the certain CC group, the UE initiates the uplinksynchronization operation to the base station, to obtain the TA valueused on the newly configured CCs from the base station. Therefore, inthis embodiment, when the base station needs to configure a new CC forthe UE, or one or multiple CCs currently used by the UE need to bereplaced by newly configured CCs, the UE may achieve the uplinksynchronization with the newly configured CCs.

FIG. 8 is a flow chart of Embodiment 7 of an uplink synchronizationprocessing method according to the present invention. As shown in FIG.8, the method of this embodiment may include the following steps:

Step 501: Send CC group information to a UE in a broadcasting manner orthrough dedicated signaling.

The CC group information is used to instruct CCs in the same CC group toshare a TA value.

Given the situation that in the multiple CCs, several CCs may share aTA, and the other CCs may share another TA, the CCs are groupedaccording to whether the CCs may share the same TA. In order to enablethe UE to obtain CC group information in advance, the UE knows,according to the group information. whether the newly configured CCsbelong to a certain CC group.

Step 502: Send an uplink synchronization indication message to the UE.

The uplink synchronization indication message may be a CCreconfiguration message or a PDCCH signaling.

The uplink synchronization indication message carries identificationinformation of one or multiple newly configured CCs, so that whenknowing, according to the identification information of the CCs, thatthe one or multiple newly configured CCs and a currently used CC do notbelong to the same CC group, the UE executes uplink synchronization onthe one or multiple newly configured CCs.

The uplink synchronization indication message carries the identificationinformation of the one or multiple newly configured CCs, and theidentification information is used by the base station, for example, aneNodeB, to indicate to the UE which CC(s) is (are) newly configured. TheCC reconfiguration message may further carry detailed configurationinformation of the newly configured CCs. In this embodiment, the uplinksynchronization indication message may be sent as an independent RRCmessage or an MAC PDU, or is sent by being carried in an RRC connectionreconfiguration message.

When knowing, according to the identification information of the CCs,that the one or multiple newly configured CCs and the currently used CCdo not belong to the same CC group, the UE executes uplinksynchronization on the one or multiple newly configured CCs. Thespecific procedure of executing the uplink synchronization may adopt arandom access procedure based on competition.

Preferably, the procedure of executing the uplink synchronization on theone or multiple newly configured CCs of this embodiment may adopt theuplink synchronization method described in any one of Embodiment 1 toEmbodiment 5, and is not described again.

Further, when the UE executes handover between the base stations, atarget base station may distributes multiple CCs for the UE to use afterthe handover in a handover command. When the multiple CCs cannot sharethe same TA, the base station may notify the UE of the CC groupinformation in the handover command.

After receiving the handover command, the UE may select, based on thegroup information of the multiple CCs obtained in the handover command,one CC from each CC group to execute the uplink synchronization.Alternatively, the base station may designate, in the handover command,one CC used to execute the uplink synchronization in each CC group forthe UE.

In this embodiment, when the CC group exists, the UE may know, accordingto the CC group information and the newly configured identificationinformation, whether the newly configured CCs belong to a certain CCgroup, and when the newly configured CCs belong to the certain CC group,the UE realizes the uplink synchronization by directly using the TAcorresponding to the CC group, and when the newly configured CCs do notbelong to the certain CC group, the UE initiates the uplinksynchronization operation to the base station, to obtain the TA valueused on the newly configured CCs from the base station. Therefore, inthis embodiment, when the base station needs to configure a new CC forthe UE, or one or multiple CCs currently used by the UE need to bereplaced by newly configured CCs, the UE may achieve the uplinksynchronization with the newly configured CCs.

FIG. 9 is a flow chart of Embodiment 8 of an uplink synchronizationprocessing method according to the present invention. As shown in FIG.9, the method of this embodiment may include the following steps:

Step 601: Receive an uplink synchronization indication message sent by abase station.

The uplink synchronization indication message carries identificationinformation of one or multiple newly configured CCs and indicationinformation of sending a Sounding RS on the one or multiple newlyconfigured CCs.

In this embodiment, the sounding reference signal may be the SoundingRS.

In an LTE system, when communicating with the base station, a UE needsto send the Sounding RS to the base station, to ensure that the basestation may detect signal quality of the UE on the entire uplinkbandwidth in real time. In this embodiment, when reconfiguring the CCfor the UE, the base station may instruct the UE to firstly send theSounding RS on the newly configured CCs, and then the base station maydetermine the TA value based on detection of the Sounding RS.

Step 602: Send the Sounding RS to the base station on the one ormultiple newly configured CCs according to the indication information.

Step 603: Receive a TA adjusting message that is sent by the basestation according to the Sounding RS, and apply the TA value carried inthe TA adjusting message to the CC corresponding to the identificationinformation.

In another embodiment of the uplink synchronization processing method ofthe present invention, the uplink synchronization indication messageincludes: a CC reconfiguration message, a PDCCH, or an MAC PDU, and theTA adjusting message includes: an extended TA value adjusting command,where the extended TA value adjusting command includes the TA value thatis on the one newly configured CC and requires adjustment, or theextended TA value adjusting command includes the one or multiple TAvalues that are on the multiple newly configured CCs and requireadjustment and identification information of the CC corresponding toeach TA value.

The extended TA adjusting command may adopt the extended TA adjustingcommand described in Embodiment 1 to Embodiment 5, and is not describedagain.

If the uplink synchronization indication message is the PDCCH or the MACPDU, the TA adjusting message is the CC reconfiguration message, and theCC reconfiguration message includes the TA value that is on the onenewly configured CC and requires adjustment, or the CC reconfigurationmessage includes one or multiple TA values that are on the multiplenewly configured CCs and requires adjustment and the identificationinformation of the CC corresponding to each TA value.

In this embodiment, the base station sends the uplink synchronizationindication message carrying the indication information enabling the UEto send the Sounding RS to the UE, so that after receiving the uplinksynchronization indication message, the UE sends the Sounding RS to thebase station, therefore, the base station obtains the TA value used onthe CC newly configured for the UE through calculation according to theSounding RS, and sends the TA value to the UE. Therefore, in thisembodiment, when the base station needs to configure a new CC for theUE, or one or multiple CCs currently used by the UE need to be replacedby newly configured CCs, the UE may achieve the uplink synchronizationwith the newly configured CCs.

FIG. 10 is a flow chart of Embodiment 9 of an uplink synchronizationprocessing method according to the present invention. As shown in FIG.10, the method of this embodiment may include the following steps:

Step 701: Send an uplink synchronization indication message to a UE.

The uplink synchronization indication message carries identificationinformation of one or multiple newly configured CCs and indicationinformation of sending a Sounding RS on the one or multiple newlyconfigured CCs.

In this embodiment, the sounding reference signal may be the SoundingRS.

In an LTE system, when communicating with the base station, a UE needsto send the Sounding RS to the base station, to ensure that the basestation may detect signal quality of the UE on the entire uplinkbandwidth in real time. In this embodiment, when reconfiguring the CCfor the UE, the base station may indicate the UE to firstly send theSounding RS on the newly configured CCs, and then the base station maydetermine the TA value based on detection of the Sounding RS.

Step 702: Receive the Sounding RS that is sent by the UE to the basestation on the one or multiple newly configured CCs according to theindication information.

Step 703: Send a TA adjusting message to the UE according to theSounding RS, and apply the TA value carried in the TA adjusting messageto the CC corresponding to the identification information.

In another embodiment of the uplink synchronization processing method ofthe present invention, the uplink synchronization indication messageincludes: a CC reconfiguration message, a PDCCH, or an MAC PDU, and theTA adjusting message includes: an extended TA value adjusting command,where the extended TA value adjusting command includes the TA value thatis on the one newly configured CC and requires adjustment, or theextended TA value adjusting command includes the one or multiple TAvalues that are on the multiple newly configured CCs and requireadjustment and identification information of the CC corresponding toeach TA value.

The extended TA adjusting command may adopt the extended TA adjustingcommand described in Embodiment 1 to Embodiment 5, and is not describedagain.

If the uplink synchronization indication message is the PDCCH signalingor the MAC PDU, the TA adjusting message is the CC reconfigurationmessage, and the CC reconfiguration message includes the TA value thatis on the one newly configured CC and requires adjustment, or the CCreconfiguration message includes one or multiple TA values that are onthe multiple newly configured CCs and require adjustment and theidentification information of the CC corresponding to each TA value.

In this embodiment, the base station sends the uplink synchronizationindication message which carries the indication information enabling theUE to send the Sounding RS to the UE, so that after receiving the uplinksynchronization indication message, the UE sends the Sounding RS to thebase station, therefore, the base station obtains the TA values used onthe CCs newly configured for the UE through calculation according to theSounding RS, and sends the TA value to the UE. Therefore, in thisembodiment, when the base station needs to configure a new CC for theUE, or one or multiple CCs currently used by the UE need to be replacedby newly configured CCs, the UE may achieve the uplink synchronizationwith the newly configured CCs.

In another embodiment of the uplink synchronization processing methodaccording to the present invention, as long as the UE receives the CCreconfiguration message or the CC reconfiguration message includes thenewly configured CCs, the UE executes the uplink synchronization. Inthis embodiment, a group of preambles may be set in advance, thepreambles in the group are dedicatedly used during CC reconfiguration;alternatively, in addition to an original random access channel, a newrandom access channel is dedicatedly set to send random-access preamblesduring the CC reconfiguration, or during the CC reconfiguration, a PUSCHresource dedicatedly used to send the random access Preambles isdispatched for the UE, to prevent negative effects on the conventionalrandom access procedure. The method of this embodiment may specificallyinclude that: the base station sends the CC reconfiguration message tothe UE; after receiving the CC reconfiguration message, the UE selects apreamble from the preamble group dedicatedly used during the CCreconfiguration and sends the preamble to the base station, or if thesystem does not have the preamble group dedicatedly used during the CCreconfiguration, but sets the new random access channel for the CCreconfiguration, the UE randomly selects one from currently availablepreambles, and sends the preamble to the base station on the new randomaccess channel dedicatedly used during the CC reconfiguration, further,if the system does not set the dedicated preamble and the new randomaccess channel for the CC reconfiguration, when sending the CCreconfiguration message to the UE, the base station may dispatch, in theCC reconfiguration message, the PUSCH resource used to send the preamblefor the UE, and the UE randomly selects one from the currently availablepreambles, and then sends the selected preamble on the dispatches PUSCHresource in the CC reconfiguration message; after receiving the preamblesent by the UE, the base station sends the TA adjusting command to theUE. The TA adjusting command needs to include the TA value, besides, itfurther needs to include the identification information of the detectedpreamble sent by the UE (the identification information may be theidentification information in the dedicated preamble group, or theidentification information of all the preambles in a current cell), andoptionally, the TA adjusting command may include the identificationinformation of the newly configured CCs. The extended TA adjustingcommand may adopt the extended TA adjusting command described inEmbodiment 1 to Embodiment 5.

In this embodiment, when the base station needs to configure a new CCfor the UE, or one or multiple CCs currently used by the UE need to bereplaced by newly configured CCs, the UE may achieve the uplinksynchronization with the newly configured CCs.

FIG. 11 is a flow chart of Embodiment 10 of an uplink synchronizationprocessing method according to the present invention. As shown in FIG.11, the method of this embodiment may include the following steps:

Step 801: Obtain a downlink timing value T1 and an uplink TA TA1 of acurrently used CC or CC pair, and a downlink timing value T2 of a newlyconfigured CC or CC pair;

Step 802: Obtain an uplink TA2 of the newly configured CC throughcalculation by applying formula (2),TA2=TA1+2×(T2−T1)  (2); and

Step 803: Apply the obtained TA2 to the newly configured CC.

In this embodiment, the UE may adjust TA situation of the newlyconfigured CC according to the TA value of the already configured CC, nomatter whether multiple CCs share the TA, the UE may calculate theuplink TA of the newly configured CC according to the downlink TA andthe uplink TA of the already configured CC and the downlink timing valueof the newly configured CC. It should be understood that this embodimentmay be combined with the methods of other embodiments, to calculate theTA value of the newly configured CCs. In this embodiment, when the basestation needs to configure a new CC for the UE, or one or multiple CCscurrently used by the UE need to be replaced by newly configured CCs,the UE may achieve the uplink synchronization with the newly configuredCCs.

In the technical solutions of all the embodiments mentioned above, theTA adjustment during the CC reconfiguration is described by takingfrequency division duplex as an example, and for time division duplex,because as for a CC, there is no differentiation between an uplink CCand a downlink CC, so that when the CC reconfiguration in any embodimentis directly replaced by the CC reconfiguration under the time divisionduplex, the methods in all the embodiments are available.

It should be particularly noted that in each embodiment where the uplinksynchronization is performed by using the dedicated preamble in thepresent invention, the method in the following may be used to replacethe using of the dedicated preamble, and a specific procedure is asfollows.

When knowing that the uplink synchronization needs to be executed on theone or multiple newly configured CCs, the UE randomly selects one ormultiple preambles, and sends the preamble to the base station on theone or multiple CCs on which the uplink synchronization needs to beexecuted. In order to enable the base station to explicitly know thepreambles selected by the UE, before sending the preambles or duringsending the preambles, the UE reports the identification information ofthe selected preambles to the base station on the currently used CC,where the UE may report the index of the selected preamble to the basestation by using any one of the manners in the following:

1) RRC signaling; 2) MAC control PDU; 3) physical layer signaling; 4)carrying the identification information of the selected Preambles in anuplink user plane data packet.

When the base station detects the preamble reported by the UE on the CCon which the uplink synchronization needs to be executed, the basestation may send the TA value to the UE by using the random accessresponse message based on the TA value obtained through the detection ofthe preamble. However, when the UE sends the same preamble on multipleCCs, the UE needs to indicate multiple TA values in the random accessresponse message, and needs to indicate the identification informationof the CCs corresponding to the multiple TA values, that is, the UE isenabled to explicitly know the corresponding relationship between the TAvalue and the CC. Alternatively, the one or multiple TA values detectedby the base station may be sent to the UE by using the extended TAcommand message or the CC reconfiguration message in each embodiment.

In addition, for a frequency division duplex system, if the base stationnewly configures an uplink CC for the UE separately, and does notconfigure a downlink CC corresponding to the uplink CC for the UE, theUE cannot obtain the T2 value. Under the situation, the UE may initiatethe uplink synchronization on the uplink CC, that is, may execute therandom access procedure on the uplink CC, or may execute the uplinksynchronization operation according to the methods of other embodimentsof the present invention.

FIG. 12 is a schematic structural diagram of Embodiment 1 of a UEaccording to the present invention. As shown in FIG. 12, the UE of thisembodiment may include: a first receiving module 11, a first sendingmodule 12, and a first processing module 13, where the first receivingmodule 11 is configured to receive an uplink synchronization indicationmessage sent by a base station, the uplink synchronization indicationmessage carries identification information of one or multiple newlyconfigured CCs; the first sending module 12 is configured to sendsynchronization signaling to the base station when knowing that theuplink synchronization needs to be executed on all or a part of the oneor multiple newly configured CCs corresponding to the identificationinformation; and the first processing module 13 is configured to apply aTA value carried in a TA adjusting message to the CC on which the uplinksynchronization needs to be executed, after the first receiving modulereceives the TA adjusting message that is sent by the base stationaccording to the synchronization signaling.

A realizing principle of the UE of this embodiment is the same as thatof Embodiment 1 of the uplink synchronization processing method as shownin FIG. 1, and is not described again.

In another embodiment of the UE according to the present invention, ifthe uplink synchronization indication message received by the firstreceiving module is a CC reconfiguration message, the first receivingmodule is further configured to receive an extended TA value adjustingcommand that is sent by the base station according to thesynchronization signaling, and the extended TA value adjusting commandincludes a TA value that is on the one newly configured CC and requiresadjustment, or the extended TA value adjusting command includes one ormultiple TA values that are on the multiple newly configured CCs andrequire adjustment, and the identification information of the CCcorresponding to each TA value.

A realizing principle of the UE of this embodiment is the same as thatof Embodiment 3 of the uplink synchronization processing method as shownin FIG. 3, and is not described again.

In still another embodiment of the UE according to the presentinvention, if the uplink synchronization indication message received bythe first receiving module is a Physics Downlink Control Channel PDCCHsignaling, the first receiving module is further configured to receivean extended TA value adjusting command that is sent by the base stationaccording to the synchronization signaling, and receive a CCreconfiguration message sent by the base station.

A realizing principle of the UE of this embodiment is the same as thatof Embodiment 4 of the uplink synchronization processing method as shownin FIG. 5, and is not described again.

In still another embodiment of the UE, if the uplink synchronizationindication message received by the first receiving module is a PhysicsDownlink Control Channel PDCCH, the first receiving module is furtherconfigured to receive a CC reconfiguration message that is sent by thebase station according to the synchronization signaling, where the CCreconfiguration message includes a TA value that is on the one newlyconfigured CC and requires adjustment, or the CC reconfiguration messageincludes one or multiple TA values that are on the multiple newlyconfigured CCs and require adjustment, and the identificationinformation of the CC corresponding to each TA value.

A realizing principle of the UE of this embodiment is the same as thatof Embodiment 5 of the uplink synchronization processing method as shownin FIG. 6, and is not described again.

In the embodiments of the UE, when knowing, according to the uplinksynchronization indication message, that the uplink synchronization doesnot need to be executed on all or a part of the one or multiple newlyconfigured CCs corresponding to the identification information, thefirst processing module is further configured to apply an indicated TAvalue in the uplink synchronization indication message to the newlyconfigured CC on which the uplink synchronization does not need to beexecuted.

Through the UE of the embodiment, when the base station needs toconfigure a new CC for the UE, or one or multiple CCs currently used bythe UE need to be replaced by newly configured CCs, the UE may achievethe uplink synchronization with the newly configured CCs by using theobtained TA value. Further, during the procedure, the UE is triggered toexecute the uplink synchronization only through the uplinksynchronization indication message, for example, the CC reconfigurationmessage or the PDCCH, to save downlink radio resources, and when the UEneeds to execute the uplink synchronization, the UE may sendsynchronization signaling to the base station, for example, a dedicatedpreamble, to obtain TA values required to be used on the newlyconfigured CCs from the base station, thereby improving an uplinksynchronization speed. When the UE knows, according to the receiveduplink synchronization indication message, that the uplinksynchronization does not need to be executed on all or a part of the oneor multiple newly configured CCs corresponding to the identificationinformation, the UE may directly apply the TA value indicated in theuplink synchronization indication message to the newly configured CC onwhich the uplink synchronization does not need to be executed, or the UEmay directly apply the unique TA value on the currently used CC to thenewly configured CC on which the uplink synchronization does not need tobe executed, so that the UE may achieve the uplink synchronization withthe newly configured CCs when it does not need to execute the uplinksynchronization.

FIG. 13 is a schematic structural diagram of Embodiment 1 of a basestation according to the present invention. As shown in FIG. 13, thebase station of this embodiment may include: a second sending module 21and a second receiving module 22, where the second sending module 21 isconfigured to send an uplink synchronization indication message to a UE,and the uplink synchronization indication message carries identificationinformation of one or multiple newly configured CCs; and the secondreceiving module 22 is configured to receive synchronization signalingsent by the UE, where the second sending module 21 is further configuredto send a TA adjusting message to the UE according to thesynchronization signaling, to instruct the UE to apply a TA valuecarried in the TA adjusting message to the CC on which the uplinksynchronization needs to be executed.

A realizing principle of the base station of this embodiment is the sameas that of Embodiment 1 of the uplink synchronization processing methodas shown in FIG. 2, and is not described again.

In another embodiment of the base station according to the presentinvention, if the uplink synchronization indication message sent by thesecond sending module to the UE is a CC reconfiguration message, thesecond sending module is further configured to send an extended TA valueadjusting command to the UE, and the extended TA value adjusting commandincludes a TA value that is on the one newly configured CC and requiresadjustment, or the extended TA value adjusting command includes one ormultiple TA values that are on the multiple newly configured CCs andrequires adjustment, and the identification information of the CCcorresponding to each TA value.

A realizing principle of the base station of this embodiment is the sameas that of Embodiment 3 of the uplink synchronization processing methodas shown in FIG. 3, and is not described again.

In further another embodiment of the UE according to the presentinvention, if the uplink synchronization indication message sent by thesecond sending module to the UE is a PDCCH signaling, the second sendingmodule is further configured to send an extended TA value adjustingcommand and a CC reconfiguration message to the UE.

A realizing principle of the base station of this embodiment is the sameas that of Embodiment 4 of the uplink synchronization processing methodas shown in FIG. 5, and is not described again.

In still another embodiment of the UE, if the uplink synchronizationindication message sent by the second sending module to the UE is aPhysics Downlink Control Channel PDCCH, the second sending module isfurther configured to send an extend TA value adjusting command and a CCreconfiguration message to the UE; or the second sending module isfurther configured to send a CC reconfiguration message to the UE, wherethe CC reconfiguration message includes a TA value of the UE, which ison the one newly configured CC and require adjustment, or the CCreconfiguration message includes one or multiple TA values of the UE,which are on the multiple newly configured CCs and require adjustment,and the identification information of the CC corresponding to each TAvalue.

A realizing principle of the base station of this embodiment is the sameas that of Embodiment 5 of the uplink synchronization processing methodas shown in FIG. 6, and is not described again.

In the embodiments of the base station, the base station may send theuplink synchronization indication message to the UE, so that when thebase station needs to configure a new CC for the UE, or one or multipleCCs currently used by the UE need to be replaced by newly configuredCCs, whether the uplink synchronization is required to be executed maybe known according to the uplink synchronization indication message, sothat the UE may achieve the uplink synchronization with the newlyconfigured CCs. Further, during the procedure, the UE is triggered toexecute the uplink synchronization only through the uplinksynchronization indication message, to save downlink radio resources,and when the UE needs to execute the uplink synchronization, the UE maysend synchronization signaling to the base station, for example, adedicated preamble, to obtain TA values required to be used on the newlyconfigured CCs from the base station, thereby improving an uplinksynchronization speed. When the UE knows, according to the receiveduplink synchronization indication message, that the uplinksynchronization does not need to be executed on all or a part of the oneor multiple newly configured CCs corresponding to the identificationinformation, the UE may directly apply the TA value indicated in theuplink synchronization indication message to the newly configured CC onwhich the uplink synchronization does not need to be executed, or the UEmay directly apply the unique TA value on the currently used CC to thenewly configured CC on which the uplink synchronization does not need tobe executed, so that the UE may achieve the uplink synchronization withthe newly configured CCs when it does not need to execute the uplinksynchronization.

FIG. 14 is a schematic structural diagram of Embodiment 2 of a UEaccording to the present invention. As shown in FIG. 14, the UE of thisembodiment may include: a third receiving module 31 and a thirdprocessing module 32, where the third receiving module 31 is configuredto receive an uplink synchronization indication message sent by a basestation, the uplink synchronization indication message carriesidentification information of one or multiple newly configured CCs; andthe third processing module 32 is configured to execute uplinksynchronization on the one or multiple newly configured CCs whenknowing, according to the identification information of the CCs, thatthe one or multiple newly configured CCs and a currently used CC do notbelong to the same CC group, where the CC group is formed by one ormultiple CCs sharing the same TA value.

Further, before receiving the uplink synchronization indication messagesent by the base station, the third receiving module 31 is furtherconfigured to receive CC group information sent by the base station in abroadcasting manner or through dedicated signaling, where the CC groupinformation is used to instruct CCs in the same CC group to share a TAvalue.

A realizing principle of the base station of this embodiment is the sameas that of Embodiment 6 of the uplink synchronization processing methodas shown in FIG. 7, and is not described again.

Through the UE of this embodiment, when a CC group exists, the UE mayknow, according to the CC group information and the newly configuredidentification information, whether the newly configured CCs belong to acertain CC group, and when the newly configured CCs belong to thecertain CC group, the UE realizes the uplink synchronization by directlyusing the TA corresponding to the CC group, and when the newlyconfigured CCs do not belong to the certain CC group, the UE initiatesthe uplink synchronization operation to the base station, to obtain theTA value used on the newly configured CCs from the base station.Therefore, when the base station needs to configure a new CC for the UE,or one or multiple CCs currently used by the UE need to be replaced bynewly configured CCs, the UE may achieve the uplink synchronization withthe newly configured CCs.

FIG. 15 is a schematic structural diagram of Embodiment 2 of a basestation according to the present invention. As shown in FIG. 15, thebase station of this embodiment may include: a third sending module 41and a fourth sending module 42, where the third sending module 41 isconfigured to send CC group information to a UE in a broadcasting manneror through dedicated signaling, and the CC group information is used toinstruct CCs in the same CC group to share a TA value; and the fourthsending module 42 is configured to send an uplink synchronizationindication message to the UE, and the uplink synchronization indicationmessage carries identification information of one or multiple newlyconfigured CCs, so that when knowing, according to the identificationinformation of the CCs, that the one or multiple newly configured CCsand a currently used CC do not belong to the same CC group, the UEexecutes uplink synchronization on the one or multiple newly configuredCCs.

A realizing principle of the base station of this embodiment is the sameas that of Embodiment 7 of the uplink synchronization processing methodas shown in FIG. 8, and is not described again.

Through the base station of this embodiment, when a CC group exists, theUE may know, according to the CC group information and the newlyconfigured identification information, whether the newly configured CCsbelong to the certain CC group, when the newly configured CCs belong tothe certain CC group, the UE realizes the uplink synchronization bydirectly using the TA corresponding to the CC group, and when the newlyconfigured CCs do not belong to the certain CC group, the UE initiatesthe uplink synchronization operation to the base station, to obtain theTA value used on the newly configured CCs from the base station.Therefore, when the base station of this embodiment needs to configure anew CC for the UE, or one or multiple CCs currently used by the UE needto be replaced by newly configured CCs, the UE may achieve the uplinksynchronization with the newly configured CCs.

Finally, it should be noted that the above embodiments are merelyprovided for describing the technical solutions of the presentinvention, but not intended to limit the present invention. It should beunderstood by persons skilled in the art that although the presentinvention has been described in detail with reference to the foregoingembodiments, modifications may be made to the technical solutionsdescribed in the foregoing embodiments, or equivalent replacements maybe made to some technical features in the technical solutions, as longas such modifications or replacements do not cause the essence ofcorresponding technical solutions to depart from the idea and protectionscope of the present invention.

What is claimed is:
 1. An uplink synchronization processing method,comprising: receiving an uplink synchronization indication message sentby a base station, wherein the uplink synchronization indication messagecarries identification information of one or multiple newly configuredcomponent carriers (CCs); and performing uplink synchronization on theone or multiple newly configured CCs, if knowing the one or multiplenewly configured CCs and a currently used CC do not belong to the sameCC group according to the identification information of the one ormultiple newly configured CCs, wherein the CC group is a group of CCswhich can use the same time advanced (TA) value.
 2. The uplinksynchronization processing method according to claim 1, furthercomprising: receiving CC group information sent by the base station in abroadcasting message manner or through dedicated signaling message,wherein the CC group information is used to instruct CCs in the same CCgroup which can use the same TA value.
 3. The uplink synchronizationprocessing method according to claim 1, wherein if the one or multiplenewly configured CCs and the currently used CC belong to the same CCgroup, apply the TA value of the currently used CC on the one ormultiple CCs.
 4. An uplink synchronization processing method,comprising: sending component carrier (CC) group information to a UserEquipment (UE) in a broadcasting message manner or through dedicatedsignaling message, wherein the CC group information is used to instructCCs in the same CC group which can share a time advanced (TA) value; andsending an uplink synchronization indication message to the UE, whereinthe uplink synchronization indication message carries identificationinformation of one or multiple newly configured CCs, wherein theidentification information is for the UE performing uplinksynchronization on the one or multiple newly configured CCs if the UEknows the one or multiple newly configured CCs and a currently used CCdo not belong to the same CC group according to the identificationinformation of the one or multiple newly configured CCs.
 5. A UserEquipment (UE), comprising: a third receiving module, configured toreceive an uplink synchronization indication message sent by a basestation, wherein the uplink synchronization indication message carriesidentification information of one or multiple newly configured componentcarriers (CCs); and a third processing module, configured to executeuplink synchronization on the one or multiple newly configured CCs whenknowing that the one or multiple newly configured CCs and a currentlyused CC do not belong to the same CC group according to theidentification information of the one or multiple newly configured CCs,wherein the CC group is formed by one or multiple CCs sharing the sametime advanced (TA) value.
 6. A base station, comprising: a third sendingmodule, configured to send component carrier (CC) group information to aUser Equipment (UE) in a broadcasting manner or through dedicatedsignaling, wherein the CC group information is used to instruct CCs inthe same CC group to share one time advanced (TA) value; and a fourthsending module, configured to send an uplink synchronization indicationmessage to the UE, wherein the uplink synchronization indication messagecarries identification information of one or multiple newly configuredCCs, wherein the identification information is for the UE performinguplink synchronization on the one or multiple newly configured CCs ifthe UE knows the one or multiple newly configured CCs and a currentlyused CC do not belong to the same CC group according to theidentification information of the one or multiple newly configured CCs.